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What Is DNS ?
DNS (Domain Name System) is an Internet service that converts user-friendly domain names into the numerical Internet protocol (IP) addresses that computers use to talk to each other. When you enter a domain name, such as www.fbi.gov, in your web browser address bar, your computer contacts DNS servers to determine the IP address for the website. Your computer then uses this IP address to locate and connect to the website.DNS and DNS Servers are a critical component of your computer’s operating environment—without them, you would not be able to access websites, send e-mail, or use any other Internet services.
DNS Changer Malware
Criminals have learned that if they can control a user’s DNS servers, they can control what sites the user connects to on the Internet. By controlling DNS, a criminal can get an unsuspecting user to connect to a fraudulent website or to interfere with that user’s online web browsing.One way criminals do this is by infecting computers with a class of malicious software (malware) called DNSChanger. In this scenario, the criminal uses the malware to change the user’s DNS server settings to replace the ISP’s good DNS servers with bad DNS servers operated by the criminal.
It is quite possible that computers infected with this malware may also be infected with other malware. The establishment of these clean DNS servers does not guarantee that the computers are safe from other malware. The main intent is to ensure users do not lose DNS services.
What Does DNSChanger Do to My Computer?
DNSChanger malware causes a computer to use rogue DNS servers in one of two ways.- First, it changes the computer’s DNS server settings to replace the ISP’s good DNS servers with rogue DNS servers operated by the criminal.
- Second, it attempts to access devices on the victim’s small office/home office (SOHO) network that run a dynamic host configuration protocol (DHCP) server (eg. a router or home gateway). The malware attempts to access these devices using common default usernames and passwords and, if successful, changes the DNS servers these devices use from the ISP’s good DNS servers to rogue DNS servers operated by the criminals. This is a change that may impact all computers on the SOHO network, even if those computers are not infected with the malware.
Am I Infected?
The best way to determine if your computer or SOHO router has been affected by DNSChanger is to have them evaluated by a computer professional. To determine if a computer is using rogue DNS servers, it is necessary to check the DNS server settings on the computer. If the computer is connected to a wireless access point or router, the settings on those devices should be checked as well.To Check your computer is affected or not here comes a simple solution. Click on the link below given by http://www.fbi.gov.
Click on the link:http://dns-ok.us/
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http://www.fbi.gov/news/stories/2011/november/malware_110911
